Removable blade shears



Aug. 4, 1953 w. B. GILSON 2,647,314 REMOVABLE BLADE SHEARS Filed July 9, 1951 INVENTOR- 1E5 :5. Qilson J6 2 BY M ATTORNEY Patented Aug. 4, 1 953 I 2,647,314 REMOVABLE BLADE SHEARS I William B. Gilson, Anderson, Ind. Application July's, 1951, Serial No. 235,685

IThis'inventionrelates to new and useful improvements in hand shears of the general type having blade sections which may be removed,

when dull, and replaced with new sections.

One object of the invention is to provide an improved construction of extreme sir'nplicityin which the removable blade sections maylbe quickly and easily replaced with new sections when dull, without the necessity ofremoving the pivot of the shears and without removing any screws or similar fasteners.

' Another object of the invention is to provide an improved construction in which each removable blade section is held in place by snapping; a detent thereon into engagement with a coacting detent on the permanent blade section which carries said removable section, the necessary yieldability to permit the snap action being inherent in the removable section.

A further object of the invention is to construct each removable blade section of relatively long and narrow form to require only a minimum of cutlery steel and at the same time provide forthe necessary yielding of said removable section to attain the above mentioned snap action. 7

The inter=snapped" detents are associated with the rear en'd of-eachremovable blade section, and a-still further object of the invention is to.

provide asimple and effective connection between the front end of said removable section and the associated permanent blade section, said connection being readily disengageableby predetermined movement of said removablesection after disengaging said detents.

Yet another object is to provide novel means whereby either removable blade section is held against springing laterally with respect to the associated permanent section.

A still further object is to provide shears of the type set forth which may be expeditiously manufactured rather inexpensively, may be profitably sold at a fair price, and will give many years of service.

With the above and other objects in view that will become apparent as the nature of the invention is better understood, the same consists in the novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawing, and claimed.

In the drawing:

Fig. 1 is a side elevation showing the shears open,

Fig. 2 is an enlarged inner edge view of one of the blades, as indicated by the arrow 2 of Figure 1,

1 Claim; (c1. 30-349) Fig. 3 is an enlarged inner side view f one of the blades,

Figs. 4 and 5 are further enlarged sectional" views on line 4-4 and 55 of Figure 3,

Fig. 6 is an enlarged inner side view of'Fone' of the permanent blade sections, partly in sec tion, the removable blade section being detached,

and

A preferred constructionhas been shown and will be rather specifically described, but'va'ria tions may well be made within the scope of'the' invention as claimed.

Two permanent blade sections? are crossed at their rear portions and pivoted together by a bolt, rivet orscrew 8, saiclsectic'msl' having handleportions 9 provided as usual loops, one of which is shown at I0.

Associated with each permanent blade sec-f tion I, isa removable blade section II having a cutting edge II.

fore, .a detailed description of one permanent'section .and the associated removable section will s'uflicie. With thisin view, the drawing shows the upper permanent and removable'sections of Fig.

l in detail.

the inner longitudinal edge I3 of the section I, it terminates inwardly of the outer longitudinal edge I4 to provide a slight forwardly facing shoulder I5.

The section I may well be gradually thickened from its front to its rear end and the latter is of greater thickness than the handle portion 9, providing a rearwardly facing shoulder I6 at the juncture of said section 'I and handle portion 9. This shoulder is located at the inner side of the handle portion 9, and said shoulder is provided near the edge I4 with a rearwardly projecting lug or detent I1. This lug or detent may well be formed by about half the diameter of a short transverse pin I8 tightly fitted in an opening in the section 1. Somewhat in advance of the shoulder I6 is the pivot-receiving opening IS.

The inner longitudinal edge I3 of the section I is preferably convexly curved longitudinally. This edge I3 is formed with a longitudinal groove 20 which extends from end-to-end thereof and.

Fig. '7 is an enlarged inner side View ofthe removable blade section'detached from Figure 6.,

with finger,

The construction of the two permanentfsections 1 isidentical'and the same is true of the two removable sections I I. Thereextends also around the nose l2. The outer edge I 4 may be straight or curved, as desired. The inner side I of the section I is preferably transversely concave to some extent as shown in Fig. 4.

Throughout the greater part of its length, the removable blade section II is relatively long and slender, and is preferably longitudinally curved. It is formed, however, with an inwardly widened front end portion 2| providing it with a rearwardly facing shoulder 22. This shoulder is concavely curved semi-circularly to provide a hooklike formation.

The rear end of the removable blade section I I is provided with a flat integral lug 23 projecting inwardly beyond the inner edge of said section II. The front edge of this lug is provided with a notch 24 near the free end of said lug, and at the juncture of said front edge with said free end, the lug corner is preferably rounded as shown at 25.

- The inner longitudinal edge of the relatively long and slender portion 26 of the removable blade section II is provided with a longitudinal ribZ'I, and the front end of this rib extends along the shoulder 22.

,When the permanent blade section I and the removable section {I are relatively assembled, they form a complete blade. To so assemble the permanent and removable sections, the hook-like -formation 22 of the section II is engaged with the nose I2 of the section I while the portion 26 of said section II is in rearwardly diverging relation with the inner edge l3 of said section 'I. The section II is then swung toward the edge l3 until the rounded corner 25 of the lug 23 strikes the detent il The section 26 is, then further forced inwardly until" I7 and 25 rearwardly spring the blade section It sufficiently for the inner end of lug 23 to pass the detent i7, whereupon this detent will snap into the notch 24. The cutlery or similar steel from which the blade section I I is formed readily allows this springing. The two blade sections are thus tenaciously connected and the rib 21 is snugly seated in the groove 23, holding the blade portion 26 against any lateral springing with respect to the section I. The inner sides of the lugs 23 of the two blades slidably engage each other during operation of the shears and each lug holds the other against any inward tilting which might allow slight turning of the blade section I I. Moreover, this blade section I I is also held against such turning by the engagement of the hook-like formation 22 with the nose I2.

Whenever a dull section II is to be removed for replacing it with a new section, it is simply necessary to force endwise upon the inner end of the lug 23 to disengage its notch or detent 24 from the detent I'I, whereupon the section II may be easily removed, and the new section substituted with equal dispatch. Both the removing operation and the operation of applying the new blade section are accomplished Without disconnecting the two permanent blade sections "I of the shears.

From the foregoing, it will be seen that novel and advantageous provision has been made for attaining the desired ends, and while preferences have been disclosed, attention is again invited to the possibility of making variations.

I claim:

In removable blade shears, a pair of permanent blade sections crossed at their rear ends, pivot means securing said sections together at their crossing point, handle sections integral with and extending rearwardly from the respective sec tions, each of said permanent sections being plO-r vided with a rounded and blunt nose at its forward end, each of said permanent sections havinga thick portion at its rear end forming a transversely extending shoulder facing rearwardly and spaced slightly rearward of the pivot means, each permanent section having a pin fitted therein aXially alined with and notched trans-v versely into the respective shoulder; in combination with a pair. of removable blade sections, each having a longitudinally extending portion fitting on the respective permanent blade section and provided with a cutting edge, each of said removable sections having one end of the longitu dinal portion extended and notched to fit over the free end of the respective blade section, and a rectangularly disposed portion extending from the opposite end of the longitudinal portion for engagement against the shoulder of the permanent section and provided with a notch fitting the respective pin.

WILLIAM B. GILSON.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,892,877 Driest Jan. 3, 1933 1,984,358 Boucher Dec. 18, 1934 2,373,607 Snell Apr. 10, 1945 2,377,906 Schaaff June 12, 1945 2,584,603 McMillan et a1. Feb. 5, 1952 

